Scope Photos - Bose Loewe Concertos Acoustimass 61247 Service Manual

Scope Photos

Figure 16. Codec (U100) Scope Photo, Un-mute Condition
Upper trace: LR_CLK (U100 pin 37) 44.1 kHz square wave
Middle trace: SDOUT1 (U100 pin 36) serial data out
Lower trace: SDNIN1 (U100 pin 34) serial data in
For each period of the 44.1 KHz clock, there are 256 bits of data clocked in/out. The first bit of the
data stream starts at the falling edge for LRCLK. The data falls into six time slots as follows:
Serial data out:
32 bits of LEFT ADC input, followed by
32 bits of AUX ADC input (not used), followed by
64 bits of nothing, followed by
32 bits of RIGHT ADC input, followed by
32 bits of AUX ADC input (not used), followed by
64 bits of nothing
Total: 64 bits from the codec
Serial data in:
32 bits of RIGHT SURROUND DAC input, followed by
32 bits of CENTER DAC input, followed by
32 bits of LEFT DAC input, followed by
32 bits of nothing, followed by
32 bits of BASS DAC input, followed by
32 bits of LEFT SURROUND DAC input, followed by
32 bits of RIGHT DAC input, followed by
32 bits of nothing
Total: 256 bits to the codec
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